Fix discussion and post list sorting

src/Api/Controller/ListPostsController.php

@@ -40,7 +40,7 @@ class ListPostsController extends AbstractListController
     /**
      * {@inheritdoc}
      */
-    public $sortFields = ['time'];
+    public $sortFields = ['createdAt'];
 
     /**
      * @var \Flarum\Post\PostRepository
@@ -120,7 +120,7 @@ class ListPostsController extends AbstractListController
         $query->skip($offset)->take($limit);
 
         foreach ((array) $sort as $field => $order) {
-            $query->orderBy($field, $order);
+            $query->orderBy(snake_case($field), $order);
         }
 
         return $query->pluck('id')->all();

src/Forum/Controller/IndexController.php

@@ -30,10 +30,10 @@ class IndexController extends FrontendController
      * @var array
      */
     private $sortMap = [
-        'latest' => '-lastTime',
-        'top' => '-commentsCount',
-        'newest' => '-startTime',
-        'oldest' => 'startTime'
+        'latest' => '-lastPostedAt',
+        'top' => '-commentCount',
+        'newest' => '-createdAt',
+        'oldest' => 'createdAt'
     ];
 
     /**